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Title:
METHOD FOR MANUFACTURING ALKALI-FREE GLASS
Document Type and Number:
WIPO Patent Application WO/2013/084832
Kind Code:
A1
Abstract:
A method suitable for manufacturing alkali-free glass having a high strain point, low viscosity, and low devitrification properties, and that, in particular, is easily float formed. A method for manufacturing alkali-free glass, comprising charging a melting furnace with glass raw material and heating to a temperature of 1400-1800°C to obtain molten glass, then forming the molten glass into a sheet by a float process, wherein heating by the flame of a burner and electrical heating of the molten glass by a heating electrode disposed so as to be immersed in the molten glass in the melting furnace are jointly used for heating in the melting furnace, and the glass raw material and a refractory are selected so that Rb > Rg, where Rb (Ωcm) is the electrical resistivity at 1400°C of the refractory constituting the melting furnace, and Rg (Ωcm) is the electrical resistivity at 1400°C of the molten glass.

Inventors:
TOKUNAGA HIROFUMI (JP)
KOIKE AKIO (JP)
NISHIZAWA MANABU (JP)
TSUJIMURA TOMOYUKI (JP)
Application Number:
PCT/JP2012/081201
Publication Date:
June 13, 2013
Filing Date:
November 30, 2012
Export Citation:
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Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C03B5/235; C03B5/03; C03B5/43; C03C3/087; C03C3/091; C03C3/093
Domestic Patent References:
WO2011001920A12011-01-06
WO2010116960A12010-10-14
Foreign References:
JPH1045422A1998-02-17
JP2000302475A2000-10-31
JP2005225738A2005-08-25
JPH06287059A1994-10-11
JPS62113735A1987-05-25
JPH05232458A1993-09-10
JPH08109037A1996-04-30
JPH1045422A1998-02-17
JP2005132713A2005-05-26
JP2009523697A2009-06-25
JP2011070092A2011-04-07
Other References:
YOSHIO OHTA; AKIRA MIYANAGA; KENJI MORINAGA; TSUTOMU YANAGASE: "Study on the Measuring Method of the Electrical Conductivity of Ionic Solutions and Melts", JOURNAL OF THE JAPAN INSTITUTE OF METALS, vol. 45, no. 10, 1981, pages 1036 - 1043
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
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Claims:



 
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